Bi4Ti3O12 modified low voltage ZnO-based varistors: microstructure, electrical properties and aging characteristics |
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| Authors: | Huanfu Zhou Ruli Guo Dongjin Chu Baocheng Chang Yuandong Qin Liang Fang |
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| Affiliation: | 1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China
2. Guangxi New Future Information Industry Co. Ltd, Beihai, 536000, China
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| Abstract: | The effects of Bi4Ti3O12 addition on the microstructure, electrical properties and aging characteristics of ZnO-based varistors were investigated. The addition of Bi4Ti3O12 can reduce the formation of Zn2TiO4 spinel phase and promote the growth of ZnO grain. Bi4Ti3O12 doped ZnO-based varistors sintered at 1,130 °C possessed excellent performance of I L = 2.9 μA, E 1mA = 29.7 V/mm, α = 30.2, and good surge absorption capability with %△E 1mA = ?3.5 % for 500 A 8/20 μs impulse current. In addition, the varistors exhibited the most stable accelerated aging characteristics with %△E 1mA = ?0.3 % for DC accelerated aging stress of 125 °C/7 h. These results revealed that Bi4Ti3O12 addition is highly beneficial to attain enhanced varistor properties of ZnO ceramics. |
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